Cr3 C2含量对Cr3 C2/Ni3 Al复合材料摩擦磨损性能的影响

采用热等静压法制备Ni3 Al合金和Cr3 C2含量不同的Ni3 Al基复合耐磨材料,利用扫描电镜、能谱仪、X射线衍射仪及摩擦磨损试验机,系统地研究Cr3 C2含量对材料组织特征、硬度及摩擦磨损性能的影响。结果表明：Cr3 C2/Ni3 Al复合材料中,Cr3 C2颗粒与Ni3 Al颗粒之间发生互扩散作用,使部分Cr3 C2颗粒转变为M7 C3( M=Cr, Fe, Ni)结构；在特定的摩擦磨损条件下,随着Ni3 Al基体中Cr3 C2比例增大,Cr3 C2/Ni3 Al复合材料的耐磨性能显著提高,达到了Ni3 Al合金耐磨性能的4~10倍。此外,随着Ni3 Al基体中Cr3 C2比例的增大,Cr3 C2/Ni3 Al复合材料对对磨盘的切削、刮擦作用减弱,对磨盘的磨损量减少。

Influence of Cr3 C2 content on the wear properties of Cr3 C2/Ni3 Al composites

The Ni3 Al-alloy and its composites with different Cr3 C2 contents were fabricated by a hot isostatic pressing ( HIP ) technique. The influences of Cr3 C2 content on the microstructure, hardness and wear properties of the Cr3 C2/Ni3 Al composites were investigated by scanning electron microscopy ( SEM ) , energy dispersive spectroscopy ( EDS ) , X-ray diffraction ( XRD ) and wear tribometry. The results show that inter-diffusion occurs between the original Cr3 C2 and the Ni3 Al particles during the HIP process and the Cr3 C2 particles partially transform into M7 C3 ( M=Cr, Fe, Ni) structures. Under specific friction and wear conditions, the wear resistance of the Cr3 C2/Ni3 Al composites is significantly improved due to the addition of Cr3 C2 particles by about 4 -10 times, compared to the Ni3 Al alloy. In addition, the cutting and scraping effects of counter-part disks by the Cr3 C2/Ni3 Al composites decrea-ses with increasing Cr3 C2 addition, resulting in a reduction in wear rate of counter-part disks.